OPERROR - ACR A ABORTED TKOF DUE TO UGA B XING THE RWY.

Narrative

RWY 7 WAS ACTIVE AND I WAS WORKING TWR LCL CTL. THE GND CTLR ASKED ME IF I WOULD ACCEPT A DEP FROM RWY 13 AND I APPROVED IT. ACCORDING TO OUR LCL DIRECTIVES; RWY 13 IMMEDIATELY BECAME 'HOT' AND GND CTL COULD NO LONGER CROSS THIS RWY WITHOUT COORD. WHEN THE ACFT CALLED FOR DEP FROM RWY 13; I SCANNED THE RWY. IT WAS CLR AND I CLRED HIM FOR TKOF. THERE WERE NO ACFT VISIBLE TO ME ON OR NEAR RWY 13. SHORTLY AFTER THIS I HEARD HIS ENG PWR DOWN AND KNEW HE WAS ABORTING TKOF. AS HE SLOWED TO ALMOST A STOP I TOLD HIM TO EXIT THE RWY AND CONTACT GND; IT WAS AT THIS TIME THAT I REALIZED HE ABORTED BECAUSE ANOTHER ACFT WAS XING THE RWY IN FRONT OF HIM. THE GND CTLR HAD GIVEN AN ACFT PERMISSION TO CROSS RWY 13 PRIOR TO IT BECOMING ACTIVE AND FORGOT TO AMEND HIS CLRNC TO HOLD SHORT AS HE SHOULD HAVE. THE XING ACFT DID NOT HAVE A LNDG LIGHT ON AND WAS NOT EASILY SEEN ON THE TXWY. BOTH ACFT WERE SINGLE ENG CESSNAS. SUPPLEMENTAL INFO FROM ACN 280359: UGA B; A C172; HAD REQUESTED TO TAXI FROM THE W RAMP TO THE BASE OF THE TWR WHICH REQUIRES A XING OF RWY 13. SHORTLY AFTER UGA B HAD BEGUN HIS TAXI ACR A; A C210; REQUESTED TAXI FOR DEP VFR TO THE E. THOUGH RWY 7 WAS IN USE ACR A REQUESTED TO USE RWY 13. I RECEIVED APPROVAL FROM LCL CTL FOR USE OF RWY 13 FOR A DEP. I THEN TAXIED ACR A TO RWY 13 AND FAILED TO HOLD UGA B SHORT OF RWY 13. ACR A RECEIVED PERMISSION FOR TKOF AND HAD BEGUN DEP ROLL AND IMMEDIATELY ABORTED HIS TKOF ROLL AS UGA B WAS XING RWY 13 AT TXWY 'F.' UGA B FINISHED XING THE RWY; ACR A TAXIED BACK TO RWY 13 AND DEPARTED WITHOUT FURTHER DELAY OR INCIDENT. IN MY OPINION THE INCIDENT OCCURRED BECAUSE OF MY COMPLACENCY AND VIRTUALLY NO TFC AT THE TIME. I DO NOT BELIEVE THAT VISUAL AIDS WILL HELP IN LOW TFC SITS AS THIS. IT JUST TAKES BEING MORE AWARE OF THE SIT AND LESS COMPLACENCY ON MY PART AS A GND CTLR.